Electric lamp



G. LEIVA ELECTRIC LAMP May 2, 1933.

Filed June '11, 1928 i: f 4 l n l1/mio@ Gasjaar Leiva,

btomm Patented May 2, 1933 PATENT OFFICE GASPAR LEIVA, OF BUENOS AIRES,ARGENTINA ELECTRIC LAMP Application led June 11, 1928, Serial No.284,484, and in Argentina May 9, 1928.

The present invention relates to improvements in electric lamps and hasessentially for its object to provide a new lamp which is of simpleconstruction, economical in its use and which offers considerableadvantage over those proposed and used heretofore, being adapted for usein connection with either direct or alternating current.

The invention also contemplates other ob- 1 jects which Will be apparentfrom the following specification, and which will be pointed outparticularly in the appended claims. In order that the present inventionmay be clearly understood and readily carried into practice it has beenillustrated by way of eX- ample in the accompanying drawing which showsa lamp constructed in accordance with the present invention, in verticalcentral section.

In this embodiment, l is the positive and 2 s the negative pole of thelamp-socket, which poles are pressed on the porcelain or otherinsulating plate 5 by means of screws. At the upper portion of the lampsocket there is a tubular, internally threaded extension by means ofwhich the lamp-socket 6 may be secured to any iron pipe or the likeimbedded in the ceiling or wall, with or without the assistance aordedby the screw 3 provided with a head of insulating material. The saidlamp-socket 6 is made of a currentconducting material and externallyprovided with a cover or outer shell of insulating material 7. The lampitself surrounds the usual filament one end of which, 9, is welded tothe conducting portion of the lamp-socket and acts as the ground pole,while the other end passes through a block of cast insulating materialor insulating base 8 which closes the cap adhering simultaneously to thelower mouth of the lamp-socket. This end terminates in a spring 13preferably provided with a ball of iron or similar material and whichmakes contact with the positive pole of the line.

The two halves of the lamp-socket 6 are threaded one to another, theupper portion being provided with a metallic threaded eX- tension 12, asin the case of ordinary lamp'- sockets, which is connected to thenegative pole 2. A screw l1 provided with an insulating head passesthrough the lower portion of the lamp-socket and may be placed, or not,in connection with the said threaded portion, in order to thus cut offthe current from the negative pole 2.

As may be seen from the foregoing the lamp according to the inventionoperates at will with one single pole, that is, the positive pole, andthe other pole to ground or, alternately, with the two poles, negativeand positive.

Evidently, dilferent constructional or detail modifications may be madewithout departing from the scope of the present invention which isclearly defined in the appended claims.

Having thus particularly described and ascertained the nature of my saidinvention and the manner in which the same is to be carried intopractice, what I claim and desire to protect by Letters Patent, is

' l. An electric incandescent lamp, comprising a filament an insulatingbase having one end of the filament passing therethrough; a yieldingcontact in the base connected to the lilament therein; and a socketsurrounding said base and to which the other end of the iilament issecured.

2. An electric incandescent lamp, comprising a filament; an insulatingbase having one end of the filament passing therethrough; a yieldingcontact in the base connected to the filament therein; a socketsurrounding said base and to which the other end of the filament issecured; and an insulating cover for the base and socket.

3. An electric incandescent lamp, comprising a filament; an insulatingbase having one end of the filament passing therethrough; a yieldingcontact in the base connected to the filament therein; a socketsurrounding said base and to which the other end of the filament issecured; a tubular metallic extension secured on the base; andadjustable means for electrically connecting the extension with thesocket.

In testimony whereof I aflix my signature.

GASPAR LEIVA.

